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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfc92d730526b6890b72fb707ab36c4d724316237d25df12612e25da32c2bd5d' 
  AND token = 'yl9P84vV60fbD/j+sOmfWAm7uG5HhX8ootcn0N5L3JM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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