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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '404703f85ec07c6e6bb2d9e29b301955483caf099193abfc9fd9affcbdf88d8e' 
  AND token = 'GQFp14g2k8nfU1AJDQWDt5RVGFpBbU3XrdF/P6Qh/hI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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