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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e400635ce30f45fe4b62b4855d299140957e0863b5f0d1654aa283155d08ac7f' 
  AND token = 'uzglfKtDRhTcomalz9nqbGunEOXS4npgV+hWxaSngGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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