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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aba29e5c0a8d565a62dadc0a44f3f91dfee131ee685c81a24a082c11d5227900' 
  AND token = 'VNYVMKOaLiZZ40X9cT6Fw1ObHdZ/Nzj7R2OPLMq5Nqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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