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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7506985bb5a699c3c87877824c1257dbe9301fbe29cf42c25b87898f7d26691' 
  AND token = 'EG59doRmpXuauqMWk9x1HIH9Z8AsGn2+dSwGYLsBplE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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