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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47e593a5248533fac6122327d5f72b89f27d04bc2c49ad5b4d3cf994004f8ad9' 
  AND token = 'fWQhHM3rp/oUb0mHYQg1+FsOcD6N9SsN3nWgADlG1po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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