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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5832bc81a56436c04159bb39f29f54b0008489c2636800bb01bc4e5844aff748' 
  AND token = '9JqhYgPFoz0HuheqqPq3CiqMIdFtgPSg0MaqWG/pcm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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