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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c52ecd50d9563bcc3f5c6637f3bd5aca0e71037e16c1ae8a17338b27e556950' 
  AND token = 'w11HL5/UdpuePMFtDa08dIf0YdaH5ax7J0b1+8a582Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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