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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e9fd8b4723a200d607a429e41879d4112c18682bf5612983c90b9711bf23d42' 
  AND token = 'Bs/9g2Dr8RPjmepnFWFfRXn82ObGvw/aXhdoh4mrNKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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