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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6752f5672280e7d53333e3f669f2559c37f559e13e57223261b86b91b68c58ca' 
  AND token = 'sIaO0rCAcYX6LQOrBgX3GU6fRqX2w4qEpi3gefTnGs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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