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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f32c313b890f2780925eb66772b5ff02f3e39a1930c004094c5c9eb85226b2c' 
  AND token = 'KqwHW1oaX5EGUoLiW6pARkCOs15UFqD7tLyvz09j3IQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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