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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c663ded79c64c39bd1e598791986299ee7a1180089c382166cb8e10b4ef3b38a' 
  AND token = 'e8QROccp2nTOUqSJ4cXdg78jqPxzmEP/Wk6dY6HU/+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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