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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f59021c76a95ddf2e91d1bed80471e18cfebcdd7341220965d968dbd388fe8e' 
  AND token = 'cgbxbb89nhJG0eNmfgXzJdHhs6imGtqF70bBX7F1/kQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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