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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6fc0c980f1f0279fcf54ee807f03e88ee6c55f2f99b42bac096da0ff2e822d9' 
  AND token = '/ap7m4uS7s/pZbaZ6usdah0fBJpYg2lw4gO/hHr4l3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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