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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8373c90aa0c62223ebc1d4c8e58ff886034b585cf22aad941e7a35804699ce7' 
  AND token = 'M3P41VqLiLSP9OVJT//QHtzydv4Urp6ueqDdjaW/sb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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