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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e5b341aebf02e406e8b06eadf5be14555ee02fa501523c55592149c417e5c3e' 
  AND token = 'jwe67CpIsZAaNr7q1do7UBaCQ0/EPubz0X+xq5TR2vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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