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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3391e1dbb1ac07714e26cbceebde0cb78a9f24ef9ae0f1de9ee03d20b1189a37' 
  AND token = 'Szbx92eicagH3D0wR0RTpCEuQVc4IUbvjDD3YfXNuS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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