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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c710c8827768010c7bc5cce2f51c8d89783fcd1992ffb0461217c5ae03d3ef76' 
  AND token = 'VizpDSU3zzM3n+ZB5yq/TFkLXW8IXukYBmL8xot+0wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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