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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '942bed9db66ea62d96280db7242a89fec813d4393793e969aec7f23ce730092e' 
  AND token = 'flLOUC0TnumKQdYt04VI5D0S3x/OUJ3cCpky5UkVhVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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