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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e89a5be8d0c7bc97ae1fc890301a42a23027d38d7ce208165b323f1a8a5e570' 
  AND token = 'idrHQpVctIlEnAgRKFVYe1CQc+VFM9xMRJMj0plFGBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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