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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f820a01e1abdf88a3328906da79555c679f958500d27cb42b4d3bca26b7ebb07' 
  AND token = '4/4E7sLQc5F8/8AXT7/qV1CFcMDxhqsepJKfZZKlcIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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