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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12602b9f0f900bcd741e6d7f82f98fc73a3909204462e4091ee2bf04a29b9771' 
  AND token = '3LcdgXgeXWF7DVLwjbYjc2QIswmR8luxFy8J6tdojKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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