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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c86f0bf21807bcac025c1dbf26e8cbfded862051243266813fbe0e5f0f692abe' 
  AND token = '9fN2ZlIde+UZ/eZimpQb2oI33xrEu2xf36PGFIgc0Fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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