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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcabe63aed6ee32f1302da8f7198fcff874ef3c5c6ee2d56793fbee02c83869b' 
  AND token = 'hl4l/nRoMBH1xNS/H3gUWXv8neJ8uanUTEKKfMXnWX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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