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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9707964ef5eec7b0ef298cde39e8f9242e449f0087a426a45cd84901314b68c5' 
  AND token = 'hZIpsF5Bpf1mSKKEj22EcG1psvJXMwZveRAaFmvxGYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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