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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83843a5b4502a48e59a6ac0d3d590a2758130787b4e4b40029c879c24dbd7443' 
  AND token = 'DhSJBm/p7gMQ7paWscqpkm4NeFARqGYVXrfr93+lJnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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