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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8628fe95b93d0650ca2d27f9279ff7ce04f0175a9de2a8738ab9553cbe2bcec3' 
  AND token = 'SlUifKLfGbjGZnfH+gNJEWMpahjVL5c0ld0v2f5+Mnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}