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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0568e5adc5efbe62462474d3a38ed1fccf5c936b2e286fa8b66666641abbc46e' 
  AND token = '7CxkSHRuHuYOXC50aPWURfEp7kGtKEu/T0NIn5sTNvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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