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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3ae216d957c7bbec2282cbecce504dd045f7e0b70143b6f73b7031362e39f74' 
  AND token = 'Tqm1XnuErHtYZwnl1HhtevEc+cquEXnUNba8IEiPYDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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