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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '993f6697d2d84b6b0952bfbd0afb96398f3719714f0ce80cdf70a841719b0aa4' 
  AND token = '1/aQlpMQ+y1ESGwXCsCc+mtEbQu5fa8FQBU98t1c6dI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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