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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a85c1cc5cc93e1c0b543e2f472f2c66bcbb33a0f3f3958dac8bec5f3fe0a14f9' 
  AND token = '1kpOYLne6Vl8Q69xQYTpiPRoPzoKYjr9VU9tFH2Hnw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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