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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cefc22d9970f9289138d0c7111cebd2e45c094f749779316d2c2e193ab9c1ab' 
  AND token = 'MsQgECS9IQH06flVZdC3o+9PG/QE0BY/JuU6QZkabtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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