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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd53f1fdded00d27475a078bce00d0eedb1d485c70a83daee5d0807354323303a' 
  AND token = '+LWw70/nYUvVgEOo/MgcZNRhxOJ9gIaypwtotitS6Y8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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