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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c36089b57ea0b571f9468a572cfb439efc08baa2dd0a1b53e2f08a1dad38a34a' 
  AND token = 'idqOSKfyEdU9U17bpWC+f9uv/rAHSymAM4Ywn8BqezI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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