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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '371625004f7bf910f7f7f795363c696f946c5adc19d951e572c166d3e0b37e50' 
  AND token = 'waMsByuwhFIAcp9T1qsVXSrxiLMP4J1xSvfB59rwnqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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