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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42dbf680760d60d137c33db2f88d80dec4640c627626d9b2ec0ff98b63a0b9db' 
  AND token = 'X8hLEW437fbqG1FY7QdxwJ8Eo5rZfEWXeI3w3HNVzRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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