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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4857a273844724c5b543b49482c16e33457a2e7f9282609a7976cc75ee296bc5' 
  AND token = 'HwGr9akCWFj+mqONativqmv4jJtwR+Eb6IM4NyR5uCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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