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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcb2f99d16ad9f378a12e9354996451e0f4825968383210d6b2a47f7152ea38d' 
  AND token = 'DP3ZjmsFzASbFMaOMLPntV0mc21204uFQ3hfZimWaTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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