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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7685d4b197cd8e6336bda007c5c64208472dd69000b2fe2f9e670ae956bf1af1' 
  AND token = 'oFqMlOjMiaQuwah6H8QikhUii4VDIZVSFjD0QLp/b8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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