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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62b5c5dd5217f40d13cc05168f6c4827bd0db0fdc47bcb257bd6886260e44fcb' 
  AND token = 'iBCGhZ+cbrBtoMSlzrmAQmjNGOmKyI2ICyYO48eJ7k8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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