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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7df9c7c5629e5a779dffb849a3d7543652b0c24331d9565a31ca5daba76c0fe7' 
  AND token = 'KoyiZn77qWTfjH4XRcRs8eEsH731EgWH2PhAXCMxdCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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