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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63bfa1f334c820d30ab5e81a32d69dc471c06e4c47853e1b3999c62768314528' 
  AND token = 'L/GFOBptX82dYwqrhEeqRSLC7lTHRaIOmdOOqo4FiUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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