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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a3c8ff66855efa4facf6b264a9e8251418531e0ebeae50c2a8ff362bcc734bd' 
  AND token = '8Ag/CtWUrTWx4vWUtF1WUhKdw3znmudqz6CLGl664Sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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