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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87168ee38d6e0c83ff7c1ac51b998e6929a18bd8b23257a798d3aa9900b50c9a' 
  AND token = 'pmpjrbaeQpO6fZ3noTZixptFmyrhdcsRo8ufu5eXb/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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