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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb499018ce49fa525146a47a88be6a73d4b68f4c16fb5361ec73d7ab0de06a13' 
  AND token = '4OpMbiWU3mBQznjnji5c8ZiL9IcFnk0vNEuqDYptuNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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