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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4e92b7d5984c2bb5483b26b12d8abd36bb5355e2e68d1af780ca01166ca6833' 
  AND token = '9JzzpQbgNeObBvcKZNv4nlzyA47btkvFU1TCGbF4iwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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