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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e055bdfe27b2d5f702182aaa352167ced78f2a7e0e6cdd634c8517ce8ded1acf' 
  AND token = 'vOzyLtsNYv9o5jUgNUotxSjZle+cSclkbgxVOz3YJ2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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