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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3a2a82f14942e47a21732c243b7f30204edcd827dc6abeda59d2e798170399e' 
  AND token = 'W5ltE4xVUUzaDERzFXs3Og+ug21yqCsPN3nhel3Ks+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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