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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '057b965df3238850a9e08ff4f0ea96e43ff978ee0948a7ea7d6fe163420cab59' 
  AND token = 'KSQrEnf9J+d5G12E4Q+CueuDGspZ/GdTvzE8xnBw9AQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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