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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28003b8d946f0e0c50a8b448f95def96e7534d41751ba2e5873d87d494e422e4' 
  AND token = 'FruXCvOwsV9mIMR4NECy55tX9K0Jrma+zcSS6CfBY7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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