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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76a0b23f3975c88322594e002d677cd19864832fe6f2a46f60d37aee23a63ce7' 
  AND token = 'gtDvypR1Jl3+m1G+nKpoXr+0pPnI6fKwHQhbesyg/io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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