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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd11341b9739edde0c5e7bf6ea58a3df584fbc4f2877c37ed1779bdd81fe5ab7f' 
  AND token = 'VIcB8qH3J65yDtlwSPt2cOS1FrzoPjciXvHyohjj0Zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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