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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b797a23f3d6535fd24aa4e321ab507d25a3ff272546251fe9722899456f13490' 
  AND token = 'he01gakdo9OSnjVXisQaAGSWxtpGy/OdWcF82W5sNf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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