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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca28e9ae4cc7e63eeaed10c5377e6105cd2f9192b22c49a87deabf621b3e1498' 
  AND token = 'iF+vzDRIU2SAKBKR7GQyLssBf9640GCq/zpF8ysXL5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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