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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a663f83cdaa7a5ffd97cedae3d8b6ae7474d32840824bbe9d3a61a2c2d455a3' 
  AND token = 'gZldcue7aswc5X40tRv8fYubxNWSIPmots4t6uL316c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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