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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feb1ab134889766f92b929dee1a633d6c226666b745817bf90f78d5fcaf1849c' 
  AND token = 'PcS+JrURRXuem0eKN4cgF9fIRuRMn6TDgZC/U3pk2CQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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