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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ab1e95b07b7dd4890f248d34234198825c7412880276a27ac5e8be8117a6d5a' 
  AND token = 'rEDgIdWU0b5cEYCI6q8QSw+L1vCIqE5S567jDFxNo2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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